Zobrazeno 1 - 10
of 316
pro vyhledávání: '"Lymperis, A."'
We construct Barrow holographic dark energy with varying exponent. Such an energy-scale-dependent behavior is typical in quantum field theory and quantum gravity under renormalization group considerations, however in the present scenario it has an ad
Externí odkaz:
http://arxiv.org/abs/2312.15767
Autor:
Lymperis, Andreas
We construct a new cosmological holographic dark energy scenario based on Loop Quantum Gravity inspired entropy, instead of the standard Bekenstein-Hawking one. The former is an extended black-hole entropy that arises from non-extensive statistics an
Externí odkaz:
http://arxiv.org/abs/2310.01050
Publikováno v:
Eur.Phys.J.C 84 (2024) 3, 297
We present how Tsallis cosmology can alleviate both $H_0$ and $\sigma_8$ tensions simultaneously. Such a modified cosmological scenario is obtained by the application of the gravity-thermodynamics conjecture, but using the non-additive Tsallis entrop
Externí odkaz:
http://arxiv.org/abs/2308.01200
Autor:
Asimakis, Petros, Basilakos, Spyros, Lymperis, Andreas, Petronikolou, Maria, Saridakis, Emmanuel N.
We construct new classes of modified theories in which the matter sector couples with the Einstein tensor, namely we consider direct couplings of the latter to the energy-momentum tensor, and to the derivatives of its trace. We extract the general fi
Externí odkaz:
http://arxiv.org/abs/2212.03821
Primordial black holes (PBHs) can generically form in inflationary setups through the collapse of enhanced cosmological perturbations, providing us access to the early Universe through their associated observational signatures. In the current work we
Externí odkaz:
http://arxiv.org/abs/2211.14900
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 84, Iss 3, Pp 1-9 (2024)
Abstract We present how Tsallis cosmology can alleviate both $$H_0$$ H 0 and $$\sigma _8$$ σ 8 tensions simultaneously. Such a modified cosmological scenario is obtained by the application of the gravity-thermodynamics conjecture, but using the non-
Externí odkaz:
https://doaj.org/article/6347152110404204b3f60246a2537d3b
Autor:
Lymperis, Andreas
Publikováno v:
JCAP11(2022)018
Motivated by the exciting features and a recent proposed general form of the function of non-metricity scalar Q, we investigate the cosmological implications in $f(Q)$ gravity, through the resulting effective dark energy sector, extracting analytical
Externí odkaz:
http://arxiv.org/abs/2207.10997
We construct a holographic dark energy scenario based on Kaniadakis entropy, which is a generalization of Boltzmann-Gibbs entropy that arises from relativistic statistical theory and is characterized by a single parameter $K$ which quantifies the dev
Externí odkaz:
http://arxiv.org/abs/2109.09181
We apply the gravity-thermodynamics conjecture, namely the first law of thermodynamics on the Universe horizon, but using the generalized Kaniadakis entropy instead of the standard Bekenstein-Hawking one. The former is a one-parameter generalization
Externí odkaz:
http://arxiv.org/abs/2108.12366
Autor:
Basilakos, Spyros1,2,3 (AUTHOR), Lymperis, Andreas4 (AUTHOR) alymperis@upatras.gr, Petronikolou, Maria5 (AUTHOR), Saridakis, Emmanuel N.1,6,7 (AUTHOR)
Publikováno v:
European Physical Journal C -- Particles & Fields. Mar2024, Vol. 84 Issue 3, p1-9. 9p.